Types of roofing materials

From a large amount of waterproofing material, today we will stop your attention on such a material as roofing material and pergamin. An ordinary roofing material is a soft waterproofing roofing material. Goes on sale in rolls, the footage of which is 10 m. This is a special cardboard, which is impregnated with the composition of oil bitumen with the subsequent application of the protective layer consisting of a layer of bitumen with interspersed of fine -grained dusty sand.